Retell AI is a versatile platform that allows you to build and deploy conversational AI applications. It provides a set of building blocks that you can customize as you need. Here’s a breakdown of different building blocks and what you can do with them.

How to choose

  1. πŸ§‘β€πŸŽ¨οΈ Dashboard (No code)

    • Build a proof of concept swiftly in 5 minutes without coding.
    • Acquire a Twilio phone number to set up an AI phone agent capable of making and receiving calls.
  2. πŸ§‘β€πŸ’»οΈ Retell LLM (Low code)

    • Access powerful APIs for agent creation, updates, and initiating phone calls, among others.
    • Enable developers to seamlessly integrate voice AI into your products.
    • Integrate with your own telephony services, such as Vonage or SignalWire.
  3. πŸ§™ Custom LLM (Fully customizable)

    • Implement any custom LLM of your choice.
    • Integrate with your own telephony services, such as Vonage or SignalWire.

Building Blocks

  • LLM APIs: a framework and a set of APIs that allows you to configure a LLM based response system for your voice agents. Read more at Retell LLM Guides

  • Agent APIs: A set of APIs that allows you to customize your agent used in the conversation. Read more at Agent Guides.

  • Call APIs: A set of APIs that allows you to make phone calls to your customers, and retrieve details about the call. Read more at Make Call Guides.

  • Phone Number APIs: A set of APIs that allows you to buy phone numbers, bind agent to phone numbers, and retrieve details about the phone numbers.

  • Advanced APIs: APIs used when you want to use your own LLM, use your own telecommunication, create a web call etc. These are protocol definitions that are being used by the previous building blocks as backbone, provides a direct interface with the internal systems of Retell.

Steps to Get Started

  1. Try our voice AI in the dashboard. (Tutorial)

    Dashboard can help you quickly set up a demo and evaluate our voice interaction experience.

  2. Integrate voice AI into your product using our API

    • We recommend start with Retell LLM. We have created the framework to easily create a LLM based response system suitable for real-time voice interactions. You have full control over the LLM behaviors.
    • If you want to integrate with your own LLM or other response system, check out Custom LLM.
  3. Configure your agent. Read more at Voice Agent Guide.

  4. Make a call with the agent configured.

    • Phone calls
      • If you don’t need to use your own number / telecommunications, check out Retell Phone Call APIs.
      • If you want to use your own number / telecommunications, check out Custom Twilio.
    • Web calls: If you want to make a call from your web application, check out Web Call.
  5. Dive into API Reference to unlock full potential.

    Explore details about each parameter and setting, understand the underlying protocol.